[gst-devel] Help needed on changing frequencies of equalizer

[Yogesh Marwaha]

2010/1/7 Maarten Bosmans <mkbosmans at gmail.com>:
> I'm not sure I quite follow you.
>
> You can just choose either system of 10 bands and set the
> centerfrequencies of the bands in the GStreamer equalizer to those
> frequencies. You can then fix the bandwidth, or better yet, fix the
> Q-factor of each band to a reasonable value.
>
> In every graphic equalizer there is some overlap between the bands,
> that's no problem.
>
> Maarten
It is centerfrequency which is troubling me. Take, for example,
upper frequency bands of winamp's equalizer (70, 180, 320,
600, 1k, 3k, 6k, 12k, 14k, 16k). For the top-most band (16k),
I would use a bandwidth of 2000, which means 15000 - 17000,
then, what about those above 17000? To cover up all frequencies
I will have to use a bandwidth of 8000 with centerfrequency of
16000 (12000 - 2000).
I could not find any documentation about Q-factor of band. What
is it? Any details about that?

Regards,

>
>
> 2010/1/7 Yogesh Marwaha <yogeshm.007 at gmail.com>:
>> Hi,
>>
>> I have a question regarding gstreamer equalizer.
>>
>> By default a 10-band equalizer supports equally distributed frequency
>> bands between 30 Hz and 15 kHz (29, 59, 119, 227, 474, 947, 1889,
>> 3770, 7523, 1511) and most other applications like amarok, winamp, vlc
>> etc. supports frequency bands between 70 Hz and 16 kHz (70, 180, 320,
>> 600, 1k, 3k, 6k, 12k, 14k, 16k).
>>
>> GStreamer allows three properties of each band to change - gain,
>> (center)frequency, and bandwidth. Hence, it seems impossible to
>> implement frequencies like those supported by other applications
>> without overlapping.
>>
>> Do you have any idea in this regard?
>>
>> --
>> Yogesh M
>> http://sparklemedia.sourceforge.net/
>> http://mazedaar.wordpress.com/
>> http://snakeeyes.wordpress.com/
>>
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-- 
Yogesh M
http://sparklemedia.sourceforge.net/
http://mazedaar.wordpress.com/
http://snakeeyes.wordpress.com/